同时访问0x10f10df48，但修改需要独占访问

Posted 2023-04-15

【中文标题】同时访问0x10f10df48，但修改需要独占访问

【英文标题】：Simultaneous accesses to 0x10f10df48, but modification requires exclusive access

【发布时间】：2018-03-07 11:17:23

【问题描述】：

我正在处理 swift4 迁移，但出现了这个警告（这使我的应用程序非常慢）。

。

上线

else if (context == &KVOContext && keyPath == contentSizeKeyPath && object as? UIScrollView == scrollView) 

找不到解决办法。

【问题讨论】：

你解决了吗？

Simultaneous accesses to 0x1c0a7f0f8, but modification requires exclusive access error on Xcode 9 beta 4的可能重复

【参考方案1】：

https://github.com/apple/swift-evolution/blob/master/proposals/0176-enforce-exclusive-access-to-memory.md 在这个链接中可以看到&KVOContext的冲突

像这样：

// CONFLICT.  Passing 'x' as an inout argument is a write access for the
// duration of the call.  Passing the same variable twice means performing
// two overlapping write accesses to that variable, which therefore conflict.
swap(&x, &x)

extension Int 
  mutating func assignResultOf(_ function: () -> Int) 
    self = function()  
  
 

我解决了

struct Pair 
  var x: Int
  var y: Int


class Paired 
  var pair = Pair(x: 0, y: 0)


let object = Paired()
swap(&object.pair.x, &object.pair.y)

我的代码是

    class Paired 
        var pair = Pair(x : "PullToRefreshKVOContext")
    

    let objects = Paired()
    override open func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) 
        if (context == &objects.pair.x && keyPath == contentOffsetKeyPath && object as? UIScrollView == scrollView) 
...